Surface-rubbing machine



April 20, 1925.

E. MAY

SURFACE RUBBING MACHINE Filed May l925 5 vwemtoz Patented Apr. 19 26;

- ERNEST MAY, OF EAST ST. LOUIS, ILLINOIS.

SURFACE-BIDDING- lU ZACHINE.

Application filed Kay 21, 1925. Serial no. a 1, 912.

To all whom it may concern:

Be it known that ERNEST MAY, a citizen of the United States, residing at East'St.

Louis, in the county of St. Clair and State.

013 Illinois, has invented certain new and useful Improvements in Surface-Rubbing Machines,-of which the following'is a specification.

The present invention-relates to surface rubbing machines and has for an object-to provide a machine adaptedparticularlyfor rubbing down painted surfaces, or other surfaces to. render the same smooth preparatory to application of paint and the like for fine finishes on automobiles and the-like.

\ Another object "of the invention is to provide in a compact machineka source of power, rubbing membersadapted to be moved against the surface, and a container enclosure'for housing the rubbing members and holding a quantity of abrasive, 'such as powdered umice stone mixed with water,

I the whole evice beingarranged formanipw 'lation' and a plication by hand; so that it may be move over the surfacebeing rubbed at the will of theoperator, and-in a convenient manner.

A further object provide a machine of this character which is equipped with a pad or brush holderarranged to maintain the rubbingelements'in such position within the casing" that,they

will be held inplaeeready for application and operation at all times, particularly when. t e machine is lifted from the surface and applied again thereto or to; a diflerent surface, thus eliminating the necessity-of -manual adjustment or the. exerciseof care" in ap' lyingthe 'devicejtothe Wit the foregoing and other objects view, the invention will'be' more fully described hereinafter, andflwill'bezmore particularly pointed out :Jili' the" claims appended hereto. Y 1 -u T 1 In the drawings,'wherein like symbols-Ire. fer to like orscorresponding partsmhroughout theseveralviews, V

Figur 1 is a side elevation of\a surface rubbing machine constructed\ accdrding to the resent invention. 1

Figure 2is a fragmentary outerend eliethe lower part of the machine" taken sub; st'antially onthe line-3v-3 of Figure2 and with.'the

' chine.

{of the tm w gqs r a the P intermediate the moved. a 5 Figure 4 is a vertical section taken through the casing and enclosed parts of the Fi re 5 and machine, substantially on the,line-4--4= of Referring to; the drawing the machine comprises a casing .or body part 10, which 1s of substantially cylindrical form and hav P d holder and other 'rdabottom plan view of the mamg a closed top 11, but being open at its 7 bottom. The casing 10 is provided thereabout with a detachable and. adjustable packing ring 12 of felt or the like which of the casing 10 and is adapted to project therebeyond a suitable distance for Yengagement w th thesurface to be treated, the

distance being such as to permit of the A v -vided .with'a number of outwardly extend of the invention is to ing pro"ections or prongs 13 which may be completely encircles the lower end portion formed y punching the metal outwardly to 1 a more or less extent for binding engage- Llfiil 12 will be comlpressedssufii ciently for hol ing it firmly to t e casing 10.

gmentinthe inner surface of the ring 12; 12 isheId about the casing 10- by The band 14 isrovided with a plurality I of inwardly punc 'ed or pressedpro'ngs or depressionslfi adapted to bite into the outer surface ojthe packing ring 12 for holdingfthe'band thereon and maintaining-the ring in fixed'position about'the casing. A suitable-contractingclampis carried by the band "14 and comprises a strap 17 pivoted at one end-,as a; 18 tojpnee'nd portion of the' band 14 and which' is offset outwardly from the band aiid adaptedto overlap the opposite end of flthe band. The free eiid ivot' 9 ends thereof, and. one end of the strap 20 isof the band 14.- The strap 17 is adapted' to swing in an edgewisedirection into overlapping engagement with the pivoted end of the strap. 20, and the free end of the latter is preferably provided with an outwardly projecting finger hold 22 serving as a handle by means of which the strap 20 may be swung upon its pivot as a lever. The strap or lever 20 ma thus be swung into the position shown in igure 2in order to longitudinally aline the straps 17 and 20 and to thus contract the band 14. into its closed position about the ring 12.. To re- 'lease or adjust the packing ring 12 it is only necessary to swing the strap or lever upwardly to move the strap 17 backwardly and separate the ends of the band 14 sufliciently to release the packing ring 12 and permit of the freeing of the band from the packing 'ring.

The top 11 of the casing is provided With a suitable bracket 23 which may be of any adaptable constructionto meet conditions of manufacture and use and upon which is supported an electric motor 24 of suitable. type provided with a shaft 25 disposed coaxial with the casing 10 and projecting outwardly through the top 11 thereof into the casing. Thei'shaft 25- is centered by 'a bushing 26 or the like which'may be mounted on the shaft or casing in such manner as to permit I of the free turning of the shaft 25.

The bracket 23 is also provided with a handle 27 projecting to one side of themotor 24 or in such other-position as may be foun' convenient for grasping in the hands to support the machine and apply and hold it to the work. Theelectric current" for. operatin the motor 24 may be carried thereto tlirough wires 28 which as shown are extended through the handle 27, and a detachable coupling or socket 29 may be provided at the outer end of the handle 27, or any other suitable electric devices convenient for manipulating and controlling the machine. The shaft 25 extends but a short distance and carries upon its inner end a pad holder which may be mounted in an 'convenientmanner uponthe shaft. In t 0 present instance the shaft 25 is threaded at'its inner end and is pro-..

vided with a pair of jam or lock nuts 30 adapted to engage against the opposite sides of the hea 31 of the pad holder. The head 31 in the present instance is in the form. of a'metallic strip of sufiicient rigidity, and which has opposite ends bent outwardly toward the open end of the 'casin 10 and twisted intermediately at sub stantially right angles to the lower face of the strip 31 and overturned upon themselves to. provide sockets 32 closed at their outer ends and open at their inner ends; for the reception of the inner ends of a:

pair of arms 33, The arms 33 are pivoted into the casing termined extent, so that when the casing 10 is applied against a surface to be rubbed the arms 33 are in such position that they may be easily sw back into the easing intooperative posit1on,and so that when the casing 10 is lifted with its lower end lowermost the arms 33 cannot swing outwardly into a dead center position, or into such position that they cannot. be easily swung back for operation merely by pressure of the surface worked upon and against the-same. e

Each arm 33 carries arubbing pad 35 of painters felt or the like similar to the packing ring 12, and which may be clamped upon one side of the arm 33 by small bolts 36 or the like, and a retaining strap 37 may be se-' cured across the outer side of the pad opposite to the arm 33. The bolts 36 pass through the strap '37 and also through-the arm 33. The pads 35 are elongated and extend outwardly from the arms and are of sufiicient width to engage over'a material area of the surface to be rubbed and the arms 33 extend entirely across the head 31 from onesocket 34 into a position atone side of the o posite socket 32', the arms 33 being slightly ent or 'olfset, as shown in Figure 5 to escape the sockets 32.- By means of this construction the'rubbing pads 35 swing into arcs of a relatively long radius, so that the wearing\of the pads is more nearly uniform and a better adjustment of the same is effected.

The top 11 of the casing is provided at one side and preferably near the annular wall of the casing with an o ning 38 into which may. poured from time to time a quantit of a grinding or polishing substance, suc

as powdered pumice stone or the like mixed with water for introducing the same into the casingduring the operation of the machine. "I g The packing-rin 12 is'adapted to fit closely against the "sur ace.being-treated and to seal the casing-10 thereagamstso that the grinding material cannot escape from the casing, andso that the particles ground or removed from the surface may be retained in the casing and the'latter cleaned out from time to time. The pads 35 may be renewed by removing them from the arms 33, and the pack'ng ring 12 may of course be adjusted to meet conditions, or may be easily renewed from a strip of painters felt or the like as occasion demands.

lOQ

a portable operation of'the machine.

It iswobvious that various changes and modifications may be.made in the de'tailsof construction and design of the above specifically described embodiment of this, inVen-' tion without departing from the spirit thereof, such changes and modifications being restricted only by the scope of the following claims.

hat is claimed is l. A surface rubbing machine comprising an enclosing casing open at its bottom, a packing ring fitting about the lower end of the casing and projecting below the same for contact with the surface to be rubbed, a clamping band detachably secured about the packing ring for binding the same against the casing, said casing and band having projections upon their inner opposite surfaces for biting engagement in the packing ring to hold the same in position, a motor mounted on the casing having a shaftprojecting into the casing, a pad holder in the casing connected to the shaft for rotation thereby,

and a handle for supporting the motor and v casing for manipulation of the machine.

;2. A surface rubbing machine comprising a casing, a motor on the casing having a shaft projecting into the same, a head strip in the casingv connected to said shaft at an intermediate point and having its ends bent' outwardly and twisted'at right angles to the strip, said bent and twisted ends of the strip.

having their extremities overturned to provide sockets closed at their outer ends, an, arm pivotally mounted at one end in each of said sockets and extending lengthwise of the strip into a position adjacent to the 0pposite socket, sai arms being adapted to engage the closed ends of the sockets when the arms are swung outwardly to limit the outward swinging of the arms, and rubbing pads secured to the free ends of said arms and extending outwardly therefrom.

3. A surface rubbing machine comprising a casing open at oneend, a motor on the casing having 'a shaft projecting through the closed end of the casing, a head secured across. the shaft in the casing and having its ends extending outwardly toward the open end of the casing and provided with sto shoulders on said ends, arms pivoted on said ends of the head near said stop shoulders, said stop shoulders being adapted to limit the swinging of the arms beyond the open end of the casing, said arms extending transversely in the casing in overlapping and crossed relation to each other, and rubbing pads mounted on the outer ends of the arms. In testimony whereof I affix my signature.

Y ERNEST MAY. 

